[分析] convex function

[laba5566 (最愛56家族 啾咪)]

f : R_+ -> R_+  f(0)=0

suppose f(x)/x is strictly increasing function for all x > 0

prove or disprove f(x) is convex function

我覺得應該是正確的

不過嘗試許久證不出來 >"<

能請板上高手賜教嗎

感謝

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